In a bold moment that probably surprised him more than the girls, Leonard abruptly walked over to Penny's open apartment door and asked her out on a date. It was the 100th episode of "The Big Bang Theory" (Thu., 8 p.m. EST on CBS), and that apparently meant it was time to re-explore the idea of putting the male and female lead together romantically.

Unfortunately, too much history took the date from awkward to downright unpleasant. Which made the subsequent phone call from Penny in the middle of the night even more unusual. Leonard was accused of thinking too much, so Penny advised him to not overthink this as she led him to their bedroom.

Since they weren't sure what all of this mean, a plan was hatched to explore a sort of new relationship, but in a beta format that only the two of them would know about it. Leonard dubbed it "Penny and Leonard 2.0," and said that to their friends they would just say they'd decided to stay as friends after that bad date.

But Leonard took the pretending too far, and upset Penny again. It's hard to pretend one thing and try to live something else. But then, because this is a show about big brains, viewers got a twist to keep them on their mental toes. It was a risky change of format for the traditional sitcom, but one the cast and creators thought worthy of tackling.

Everything they'd just seen was Leonard overthinking what would happen if he walked over to Penny's open apartment door and asked her out on a date.

He did it anyway, even though it seemed to go badly in every scenario he ran, and events started to play out in a very similar fashion, with a few key changes. Was this now reality, or was this just the beginning of Penny overthinking what would happen if she said yes to Leonoard asking her out on a date -- after a very severe overthink that saw her pregnant at their wedding.

"The Big Bang Theory" gets started on its next 100 episodes every Thursday night at 8 p.m. EST on CBS.

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What To Watch: TV Picks For January 16 - 22

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"Alcatraz" (8 p.m. EST, Fox) two-hour series premiere
Produced by J.J. Abrams, this moody mystery series combines procedural elements with a hint of supernatural suspense. Detective Rebecca Madsen (Sarah Jones) and Alcatraz historian Doctor Diego Soto (Jorge Garcia) team up with a secret agency that is dedicated to finding and catching inmates from the infamous prison who went missing 50 years ago and have begun reappearing today.

"Betty White's Off Their Rockers" (9:30 p.m. EST, NBC) series premiere
Have you ever imagined a show like "Punk'd," but instead of Ashton Kutcher and Dax Shepard jumping out to humiliate a celebrity, Betty White and a band of "sassy septuagenarians" prank youngsters instead? No? Well, White and NBC made a show about it regardless, taking the hidden camera concept to another level as senior citizens target unsuspecting bystanders for stunts and sketches.

"Lost Girl" (10 p.m. EST, SyFy) series premiere
A young woman (Anna Silk) discovers that she has dangerous supernatural abilities, and must choose between a life of light or darkness as she tries to unlock the mysteries of her past. (Read The Huffington Post's TV critic Mo Ryan's thoughts on the sexy supernatural drama here.)

"Remodeled" (9 p.m. EST, The CW) series premiere
The CW's newest reality show centers around modeling industry veteran Paul Fisher as he tries to bring together hundreds of small agencies around the world in a new venture called The Network. He has two missions: to make sure agents in small towns no longer get screwed, and to empower models to take control of their careers and lead healthier lives.

"Justified" (10 p.m. EST, FX) season premiere
Timothy Olyphant's critically-acclaimed drama returns for a third season. The arrival of a dangerous new player in Lexington puts Raylan on a collision course with a sadistic Dixie Mafia hitman.

"Southland" (10 p.m. EST, TNT) season premiere
Sadly for those that don't own a DVR, TNT is premiering the long-awaited fourth season of the gritty police drama right opposite "Justified," and both are equally worthy of your attention. Officer John Cooper returns to duty after recovering from back surgery and meets his new partner, Officer Jessica Tang (special guest star Lucy Liu), a tough and disciplined cop with her own set of baggage from working the streets. Elsewhere, Lydia, whose new partner is Ruben Robinson (guest star Dorian Missick), can't seem to escape helping a former CI who won't stay in safety.

"White Collar" (10 p.m. EST, USA)
And, as if 10 p.m. wasn't busy enough, "White Collar" returns from its midseason hiatus with one hell of a mystery: Where is Elizabeth Burke? Neal and Peter must race to rescue her from Keller, who is demanding the U-boat treasure in exchange for her release.

"American Idol" (8 p.m. EST, Fox) two-hour season premiere
The ratings juggernaut returns for another year with a fresh crop of hopefuls lined up to audition and the eclectic panel of Jennifer Lopez, Steven Tyler and Randy Jackson poised to narrow them down -- hopefully without deafening us all.

"Happy Endings" (9:30 p.m. EST, ABC)
Jane convinces Penny to stop changing herself for every guy she dates, and instead to change the guy to suit her needs. Penny's first experiment is Jeff (guest star Ryan Hansen), a slacker who is 30 going on 20. Meanwhile, when Brad overhears Jane bragging to Penny about how she completely made him over after they met, he rebels, and starts walking, talking and dressing like his college-era self. And Alex and Max stage an "in-t-vention" to stop Dave from his obsession with v-neck t-shirts.

"Royal Pains" (10 p.m. EST, USA)
Kassabian is left in critical condition after a prescription error, which Hank believes is Dr. Van Dyke's fault. Elsewhere, the HankMed team goes to a divorce party so Hank can keep an eye on the ill party planner.

"The Big Bang Theory" (8 p.m. EST, CBS)
In the 100th episode of the hit sitcom, the possibility of Leonard and Penny getting back together could prove disastrous, after Leonard offers Penny a spur-of-the-moment invitation to a romantic dinner for two.

"Parks and Recreation" (8:30 p.m. EST, NBC)
Faced with a tough new opponent, Leslie and Ben disagree on the content of her first campaign ad. Ron is very uncomfortable when Chris tries to befriend him, while Andy and April make a trip to the doctor.

"Archer" (10 p.m. EST, FX)
The ISIS gang is back with a bang after a painfully long midseason hiatus; Archer is shocked to learn that his mother is dating Archerʼs idol/hero/man-crush, Burt Reynolds.

"Shark Tank" (8 p.m. EST, ABC) season premiere
The Sharks are back for a third season, continuing their search to invest in the best products and businesses that America has to offer. Season 3 sees the Sharks offering over $6.2 million of their own money in investment deals to bankroll a creative array of innovative entrepreneurs.

"Fringe" (9 p.m. EST, Fox)
Peter's visit to the other side intensifies as the alternate Fringe division faces off against a formidable new foe (though he's someone we know all too well) in a harrowing race against time. But what does this universe's David Robert Jones want?

"On Freddie Roach" (9:30 p.m. EST, HBO) series premiere
From executive producer Peter Berg ("Friday Night Lights"), this cinéma-vérité documentary series focuses on Freddie Roach. The world famous boxing trainer owns and operates the famed Wildcard Boxing Club in Hollywood, where he has produced a host of world champions. The cameras follow Roach as he works with future stars, engages the continuous stream of celebrity visitors to his gym, finds time to sort through and balance his myriad of outside interests, and manages his new role with USA Boxing, all while fighting Parkinson's disease.

"An Idiot Abroad" (10 p.m. EST, Science) season premiere
After his tour of the Seven Wonders of the World, Karl Pilkington could be considered an international jetsetter. But his recent global exposure has made him even more resistant to the call of the open road. Nevertheless, world class tormentors Ricky Gervais and Stephen Merchant prove that one man's anguish can be another man's amusement, as they send him around the world to fulfill his Bucket List. Now, Karl can only hope that his quest to accomplish the definitive list of "things to do before you die" doesn't kill him first.

"Once Upon a Time" (8 p.m. EST, ABC)
Mary Margaret and David continue to grapple with their unrequited love, and Emma and Regina grow suspicious over a mysterious new stranger in town. Meanwhile, in the fairytale land that was, Snow White yearns to ease her breaking heart as Prince Charming's wedding to King Midas' daughter approaches.

"Prime Suspect" (9 p.m. EST, NBC) series finale
Fans of the short-lived procedural will be pleased to see the final two episodes the show's first and only season in a double bill tonight (NBC still hasn't officially canceled it, but shutting down production was a fairly obvious signal). In the first hour, Duffy and Calderon have the unpleasant task of telling a grandmother that her young granddaughter was raped and murdered, while Jane and Augie are on the ritzy Upper East Side when a woman is found mysteriously shot during the night. In the second, Jane and the team find out a jailed hit man may be responsible for the latest drive by at local store, and Sweeney orders 24-hour a day security when a hit is ordered on one of their own.